Engine.



P. HENNBBHLB.

ENGINE.

APPLICATION FILED 00T. so, 1909.

'Patented Feb. 3, 1914.

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P. HBNNEBO'HLB.

ENGINE.

APPLICATION FILED 0.'1T.30I 1909.

1 ,086,047, Patented Feb. 3, 1914.

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ENGINE.

Specification of Letters Patent.

Patented Feb. 3,1914.

Application filed October 30, 1909. Serial No. 525,482.

To all, whom it may concern:

Be it known that I, FRANK HENNEBHLE, a rcitizen of the United States, residing at Chicago,in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Engines, of which the following is a specification.

This invention relates to compound steam engines and its object is to provide a combined steam receiver and valve chest and an improved valve mechanism for. compound engines.

In the accompanying drawings, Figure 1 is a sectional view, partly in elevation, of a cross compound steam engine embodying the features of my invention. Fig. 1a is a sectional det-ail illustrating the means for admitting steam to the high-pressure cylinder and for exhausting steam therefrom. Fig. 2 is a section on line 2 2 of Fig. 1. Fig. 3 is a section on line 3 3 of Fig. 2. Fig. 4 is a section of line 4 4 of Fig. 1. Fig. 5 is an enlarged sectional view of one of the istons. Fig. 6 is a detail view of a valve D which may be employed in said piston. kFig. 7 is a face view of one of the slide valves. Fig. 8 is a. sectional detail view of said valve.

The embodiment selected for illustration comprises a high-pressure cylinder 1 and a low-pressure cylinder 2, the combined receiver and valve chest 3 and the engine shaft 4. In each of the cylinders 1 and 2 are slidably mounted two pistons 5 and 6 arranged to move alternately toward and from each other, steam being alternately expanded between the pistons and between each pistonand the adjacent cylinder head. The pistons 5 and 6 are connected to diametrically opposite cranks upon the engine shaft, the connection for the cylinder 5 consisting of a piston rod 7 and a connecting rod S extending between said piston rod and the crank 9. The connection between the piston 6 andl the engine shaft consists in this inst-ance of two piston rods 10 and a connecting rod 11 joining each piston rod to a crank 12. The piston rod 7 extends through a. packed central opening in the piston 6.

In Fig. 1 the valve is about to admit steam into the opposite ends of the cylinder 2, the pistons being `about to commence their approaching movement under the expansive Y power of the steam. In such movement the cranks 12 are pulled upward and the crank 9 is pushed downward, the upward force exerted upon the cranks 12 being substantially equal to the downward pressure placed upon the crank 9. It will therefore be seen that the two forces tending to turn the crank shaft are exerted in directly opposite directions and are substantially balanced. There is consequently practically no tendency to move the crank shaft against one side of its bearings and thus pounding and friction in said :bearings are reduced to a` minimum. During such approaching movement of the pistons, there is an upward pressure on the 'upper cylinder head and a downward pressure on the lower cylinder head. These forces, which are substantially equal and exerted in opposite directions, are

resisted by the cylinder walls, no part of vthe cranks 12 being pushed downward; consequently, during the separating movement of the pistons, as in the case of the app-roaching movement, the forces acting upon the shaft are substantially balanced and pounding and friction are substantially eliminated. During the separating movement of the pistons, no pressure is exerted upon the cylinder heads.

In order to prevent the leakage of steam thro-ugh the opening 13 in the piston 6, through which the piston rod 7 passes, suitable packing may be provided. I- have herein shown the piston as having therein a stuffing box or chamber 14 (Fig. 5) containing packing material 15, which packing material is held in fluid-tight contact with the rod 7 by steam pressure. Steam is admitted to the chamber 14 through ports 16 and 17, a chamber 18 and a passage 19. Within the chamber 1S is a double valve member 20 adapted to close either of the ports 16 and 17. Said valve member has guide stems 21 extending within the ports 16 and 17 When steam is admitted to the through the duct 19 enters the chamber 14 and presses the packing material 15 against the rod 7. lVhen steam is admitted to the space between the piston 6 and the adjacent cylinder head, the steam enters the port 17, closes the port 16 and enters the chamber 14. Steam pressure may also be used to held the piston packing 22 against the cylinder walls by connecting the groove 23 in which said packing is mounted with the chamber 1S by means of a duct 24.

For each of the cylinders 1 and 2 there is provided, in the combined receiver and valve chest, a slide valve 25 arranged to be reciprocated over the valve face 26. Said face is connected with the space between the pistons by a port 27, with the ends of the cylinder iby ports 28 29 30, and with the exhaust 31 or the steam supply pipe 32, as the case may be, by a port 33. The valves 25 are mounted at opposite sides of a web or backing 34.

Each valve 25 is provided with a short stem 35, said stems being attached through the medium of a yoke 36 with a valve rod 37 which is connected through a reversing link motion 38 with the eccentrics 39 on the shaft 4. The rod 37 extends through a stuffing box structure 45, the attaching portion of which is seated in a threaded opening 46 in the Wall of the steam receiver. Similar openings 47 48 are provided in said wall for use when it is desired to move the valves 25 by means of individual eccentrics, as when the cranks of one engine are set ninety degrees ahead of the cranks of the other. lVhen not in use the openings 47 48 are closed by screw plugs 49.

Upon the rear side of each valve 25 is an annular flange 39 with which the flange 40 of a disk 41 telescopes. In the chamber 42 formed between the valve and the disk 41 is a coiled spring 50 assisting to hold the valve against the valve face and the disk 41 against the backing 34. The chamber 42 communicates with the working face of the valve 25 through ports 51. The fluid pressure upon the side of the disk 41 toward the valve is balanced by pressure admitted to a shallow recess 52 in the opposite side of said disk through a port 53.

I desire to call attention to the fact that the steam receiver 3 is located between the cylinders and may be formed integral with said cylinders. The receiver 3 also serves as a valve chest. This construction conduces greatly to compactness and cheapness, and reduces condensation to the minimum.

High pressure steam is admitted internally of the valve for the high-pressure cylinder, steam being exhausted from said cylinder externally to the valve and directly into the receiver. Low pressure steam is admitted to the low-pressure cylinder externally of the valve for said cylinder, steam being exhausted from said cylinder internally of the valve and to the pipe 31.

lu order that steam at an increased pressure may be supplied to the low-pressure cylinder, l provide a by-pass 43 in which is located a regulating valve 44 of any approved construction, whereby steam at the desired pressure may be admitted to t-he receiver 3.

I claim as my invention:

1. The combination of a high-pressure cylinder7 a low-pressure cylinder, a single combined steam receiver and valve chest directly connected by ports to said cylinders, valve means in said combined steam receiver and valve chest for controlling the flow of steam in said ports and means for admitting' high-pressure steam internally of the valve for the high-pressure cylinder.

2. The combination, in a cross-compound engine, of a high-pressure cylinder and a low-pressure cylinder arranged side by side, a single combined steam receiver and valve chest located directly between said cylinders and directly connected by ports to said cylinders, valve means in said combined steam receiver and valve chest for controlling the flow of steam in said ports and means for admitting high-pressure steam internally of the valve for the high-pressure cylinder.

3. The combination of a high-pressure cylinder, a low-pressure cylinder, a combined steam receiver and valve chest located between said cylinders and operatively connected by ports to said'cylinders, a valve member in said combined receiver and valve chest for each of the cylinders, means for admitting steam internally to the high-pressure valve, the high-pressure cylinder exhausting into the receiver externally of the high-pressure valve, the low-pressure valve admitting steam externally of itself from the receiver to the low-pressure cylinder, and exhausting steam from the low-pressure cylinder internally of said low-pressure valve.

4. The combination of two cylinders arranged in parallelism, a combined steam receiver and valve chest connected by ports to said cylinders, a Web Within said receiver, a single valve for each of said cylinders, said valves being .slidably supported by said web, and means for reciprocating said valves.

5. In a compound engine, the combination of a high-pressure cylinder; a low-pressure cylinder; a shaft; opposed cranks on said shaft for each cylinder; two pistons in each cylinder connected to said cranks to move in opposite directions; a combined steam receiver and valve chest directly connected by ports to said cylinders; and a single valve for each cylinder located in said combined steam receiver and valve chest and operated from said crank shaft.

6. In a cross-compound engine, the combination of a high-pressure cylinder and a lowpressure cylinder arranged side by side; a crank shaft ;pistons in said cylinders connected to said crank shaft; a valve for each cylinde1';eccent1c means on said shaft for operat- Valves being located in said combined steam lng sald valves, there belng only sufolent recelver and valve chest. space on sald shaft between the englnes to re- FRANK HENNEBHLE. celVe sind eccentrlc means; and a slngle cornbned steam receiver and Valve chest located Witnesses: directly between the cylinders and directly C. PAUL PARKER, connected by ports to said cylinders, said GEORGE L. CHINDAHL.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C. 

